Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 27
Traction Circuit Problems
Problem Possible Cause
Neutral is difficult to find or unit oper-
ates in one direction only.
External control linkage is misadjusted, disconnected, binding or
damaged.
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Test in the Testing section of this chapter).
Traction response is sluggish. Hydraulic oil is very cold.
Parking brake is applied or incorrectly adjusted.
Piston pump by--pass valve is open or defective.
Charge pressure is low (see Charge Relief Valve Pressure Test in
the Testing section of this chapter).
Relief valve(s) in piston (traction) pump are leaking or damaged.
Wheel motor(s) is w orn or damaged (see Wheel Motor Efficiency
Test in the Testing section of this chapter).
Piston (traction) pump is worn or damaged (see Piston (Traction)
Pump Flow Test in the Testing section of this chapter).
No traction exists in either direction. Parking brake is applied or incorrectly adjusted.
Oil level in reservoir is low (other hydraulic systems also affected).
Piston pump by--pass valve is open.
Charge pressure is low.
Relief valve(s) in piston (traction) pump are leaking or damaged.
Wheel motor(s) are worn or damaged (see Wheel Motor Efficiency
Test in the Testing section of this chapter).
Piston pump is w orn or damaged (see Piston (Traction) Pump Flow
Test in the Testing section of this chapter).
Wheel motor will not turn. Brakes are binding.
Key on wheel motor shaft is sheared or missing.
Wheel motor is damaged.
Wheel motor will not hold load in
neutral.
Make up fluid from charge pump is not available.
Piston pump relief v alves are faulty.
NOTE: The piston pump used on Greensmaster Tri-
Flexmachinesisequippedwithreliefvalvesforboththe
forward and reverse direction. Due to engine output, it
is unlikely that traction pressure will reach relief valve
settings. If, however, a piston pump relief valve is leak-
ing or otherwise faulty, traction performance would be
affected.
Hydraulic
System
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